Gelation timing device



jam. 24, 1956 R. L. PARRETTE ETAL 2,731,828

GELATION TIMING DEVICE Filed Feb. 6, 195] INVENTOR JOHN S. B/LLHE/MER mB/CHARD L. PARRETTE United States PatentO 2,731,828 GELATION TIMING DEVICE Richard L. Parrette and John S. Billheimer, Pasadena,

alifi, assignors, by mesne assignments, to Aer-met- Gemlalral Corporation, Cincinnati, Ohio, a corporation ofO in Application February 6, 1951, Serial No. 209,594 1 Claim. (Cl. 73-150) continuous observations at regular mine when the actual gelation takes place.

The need for precise and automatic determination of the gelling time of We have succeeded in developing a device which accurately determines without requiring any supervision, the interval at which a resin gels. A feature of the device top of the polymerized resin.

The invention will be better understood with reference to the following description and accompanying drawings in which:

Fig. 1 represents a on a diameter; and

Fig. 2 is a plan view of the revolving plate with the bead receptacles shown thereon.

Referring to the drawing of Fig. l, the device comprises essentially a subplatform 10, preferably circular in shape, and mounted on suitable supports 11 extending upwardly from a base 12. Base 12 is provided with a vertical bearing 13 which supports the central portion of subplatform 10. Bearing 13 12a which supports a rotates. Shaft 15 is either provided with a splined or squared end 16 there is provided an axial extension of the shaft 17 cross section view of the device taken Patented Jan. 24, 1956 projection 16 of the shaft 15, plurality of eqni-angular portions. radii is provided with a plurality of the required intervals. The holes the thickness of the plate.

small holes 25 at 25 continue through The disc is secured to the splined or square shaft by any suitable fastener which would thread on extension 17. I

A plurality of holes 20 are arranged on a radius of the subplatform 10. These holescorrespond in spacing to the holes on the diameter 200 passes through each hole 20 and of subplatform 10.

through the bottom of the base 12 plurality of flexible tubes 22, of slightly larger diameter than the tubes 20a, are attached to projections 21 and lead to a corresponding number of test tubes, or other is flush with the up Tubes 20a project a short distance. A

tive resin container 26.

Fig. 1 shows the manner in which the heads will arrange themselves in a resin during a test. In tube 26 spherical beads Will drop immediately into each tube 26 upon being discharged when the orifices 25 come in contact with the holes 20.

The device shown in Fig. 2 is designed for use with apparatus capable of conducting five tests simultaneously.

However, by increasing the number of holes on a radius and conduits, it is possible to make the apparatus applicable for testing a larger number of samples.

The device is constructed so that a bead is dropped simultaneously into each of the five resin containers at regular intervals of time. in the event that the resins require a long time before polymerization takes place, it is possible to alter the rate of angular rotation of the bead carrier by merely changing the gear or pulley combination, thus instead of completing one revolution in twenty-four hours the bead carrier can be made to complete one revolution in a longer period of time such as thirty-six, forty-eight, or seventy-two hours. If the resins are expected to polymerize rapidly the speed of the bead carrier can be increased by proper gearing or pulleys so that a complete revolution takes place in a shorter time such as sixteen or eighteen hours.

We claim:

A timing device for determining the gelation period of a resin comprising: a fixed platform, means for supporting said platform,'bearing supporting means projecting upwardly from said platform, a shaft bearing within said bearing supporting means, a second fixed platform supported by said bearing supporting means, a movable shaft within said shaft bearing, said shaft resting on a second bearing means located at the bottom of said shaft bearing, the upper end of said shaft extending beyond the end of said shaft bearing and said second fixed platform, means for securing a disc to said shaft, said disc just Cir clearing said second fixed platform and being provided with 'a plurality'of groups of holes on radii, each group of said holes having their centers on a same radius, said radii being spaced a uniform angular distance apart on said disc, driving means connected to the end of said shaft above said disc securing means, a plurality of tubes having their axes falling on a straight line positioned to correspond to a row of holes in said disc, said tubes extending through said second fixed platform and having an opening 'flush with the upper surface of said second fixed platform, a plurality of resin sample containers, means for communicating said tubes with corresponding ones of said sample containers, a timed constant speed driving means, and means for connecting said constant speed driving means to the driving means on the end of said shaft,

References Cited in the file of this patent UNITED STATES PATENTS 

